Ten years ago, Caroline McKenzie's brother left the house and disappeared. Nobody saw him again. But once a year, on Mother's Day, Mac calls his family, reassures them that he's okay, and hangs up. After another call, Carolyn makes a firm decision to find her brother and turns to the police for help. She soon learns that a young woman living next door to her, Lizzie Andrews, has disappeared under similar circumstances. Detective Roy Barrott puts forward the theory that Mack is involved in this case. Moreover, his name is associated with the disappearance of several other girls. Caroline, convinced of her brother's innocence, begins a desperate and dangerous search for the truth.